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mpg123 - Fast console MPEG Audio Player and decoder library

The mpg123 distribution contains a real time MPEG 1.0/2.0/2.5 audio player/decoder for layers 1,2 and 3 (most commonly MPEG 1.0 layer 3 aka MP3), as well as re-usable decoding and output libraries. Among others, it works on GNU/Linux, MacOSX, the BSDs, Solaris, AIX, HPUX, SGI Irix, OS/2 and Cygwin or plain MS Windows (not all more exotic platforms tested regularily, but patches welcome). You may jump to the non-exhaustive list of features.

It is free software licensed under LGPL 2.1 .

Note that nowadays, the mpg123 decoder core can work with floating point or integer math and with some tuning between accuracy and performance at build-time, using assembly optimizations for several platforms, depending on your build configuration. There is detection and selection of assembly optimisations on x86, x86-64, and ARM at program runtime. It's fast, it's high-quality. Just use it;-)

Top News

2025-06-07 thomas: Releasing mpg123 version 1.33.0:
  • mpg123
    • Fix printout of filenames at end (convert/limit text encoding).
    • Treat HTTP header encoding as unknown/ASCII and formally convert to UTF-8.
    • Make --continue mode work with --random.
    • Handle possible failure of __wgetmainargs on Windows (bug 375).
  • mpg123-id3dump: Fix up command line arg handling for Windows.
  • out123
    • Finally give zero exit code when generating sounds, not indicating spurious failure.
  • build:
    • Use CCASFLAGS for assembler tests, to enable builds that enable instruction sets that way (bug 377).
    • PIC for compat libs (convenience libs used during build) only if building shared libs (github PR 17 by Wouter Wijsman).
  • compat:
    • Map strtok use to strtok_r or strtok_s (MS platforms), if possible. users only in control_generic and libout123 so far. Out123 itself uses mytok. Shall fix bug 376 (build with MSVC again).
    • Enable build on PSP by merging in the hotfix of opmitting signal code (github PR 18 by Wouter Wijsman).
  • libout123
    • modules/win32: Align waveOutGetDevCapsA to WAVEOUTCAPSA, in anticipation of some UNICODE change.
  • libmpg123
    • API version 49 with added mpg123_open_handle64(), mpg123_open64(), and mpg123_open_fixed64() that are not subject to largefile renaming. This means you can still access internal I/O with MPG123_PORTABLE_API. The code has been there before, anyway.
    • With MPG123_PORTABLE_API, mpg123_open_handle() is hidden now (use mpg123_open_handle64() instead).
    • more silence on errors (sideband limit message)

Head over to the download section for getting your hands on the release.

For older news see the news archive

ISO MPEG compliance

This is a rough log of an automated compliance test on the mpg123 webserver (Xeon E3, GNU/Linux), using the test bitstreams from the ISO MPEG reference set. At least the floating point output should really be close enough to the reference.

Regarding the method: This is comparing mpg123's output (with gapless code deactivated) from reference bitstreams to the reference output. A simple RMS error measure is employed, relative to full scale, just summing over mono or stereo data indiscriminently. This is my interpretation of the rules... maximum allowed RMS=8.80967e-06, maximum signal difference 6.10352e-05. 

compliance test for mpg123-1.33.0-dev+20250607022201 on Linux x86_64
First decoder in this list will be tested first, then generic: 
Supported decoders: AVX x86-64 generic generic_dither

Testing default decoder...

==== Layer 1 ====
--> 16 bit signed integer output
fl1.bit:	RMS=4.364373e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl2.bit:	RMS=4.353138e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl3.bit:	RMS=4.348759e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl4.bit:	RMS=4.403421e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl5.bit:	RMS=4.323446e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl6.bit:	RMS=4.389602e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl7.bit:	RMS=3.826083e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl8.bit:	RMS=4.362205e-06 (PASS) maxdiff=7.629395e-06 (PASS)
--> 32 bit integer output
fl1.bit:	RMS=1.967634e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl2.bit:	RMS=1.971686e-08 (PASS) maxdiff=1.117587e-07 (PASS)
fl3.bit:	RMS=2.002386e-08 (PASS) maxdiff=1.341105e-07 (PASS)
fl4.bit:	RMS=1.902169e-08 (PASS) maxdiff=1.266599e-07 (PASS)
fl5.bit:	RMS=3.655859e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl6.bit:	RMS=3.069318e-08 (PASS) maxdiff=1.629815e-07 (PASS)
fl7.bit:	RMS=1.768833e-08 (PASS) maxdiff=8.940697e-08 (PASS)
fl8.bit:	RMS=1.857219e-08 (PASS) maxdiff=8.428469e-08 (PASS)
--> 24 bit integer output
fl1.bit:	RMS=4.096055e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl2.bit:	RMS=4.156199e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl3.bit:	RMS=4.126996e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl4.bit:	RMS=4.100406e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl5.bit:	RMS=4.574976e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl6.bit:	RMS=3.920292e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl7.bit:	RMS=4.186568e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl8.bit:	RMS=4.104751e-08 (PASS) maxdiff=1.192093e-07 (PASS)
--> 32 bit floating point output
fl1.bit:	RMS=1.967635e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl2.bit:	RMS=1.971679e-08 (PASS) maxdiff=1.117587e-07 (PASS)
fl3.bit:	RMS=2.002391e-08 (PASS) maxdiff=1.341105e-07 (PASS)
fl4.bit:	RMS=1.902160e-08 (PASS) maxdiff=1.266599e-07 (PASS)
fl5.bit:	RMS=3.655860e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl6.bit:	RMS=3.069316e-08 (PASS) maxdiff=1.629815e-07 (PASS)
fl7.bit:	RMS=1.768828e-08 (PASS) maxdiff=8.940697e-08 (PASS)
fl8.bit:	RMS=1.857223e-08 (PASS) maxdiff=8.428469e-08 (PASS)

==== Layer 2 ====
--> 16 bit signed integer output
fl10.bit:	RMS=3.512100e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl11.bit:	RMS=3.837267e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl12.bit:	RMS=3.901071e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl13.bit:	RMS=4.379583e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl14.bit:	RMS=4.112578e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl15.bit:	RMS=4.388568e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl16.bit:	RMS=4.147495e-06 (PASS) maxdiff=7.688999e-06 (PASS)
--> 32 bit integer output
fl10.bit:	RMS=1.777418e-08 (PASS) maxdiff=8.475035e-08 (PASS)
fl11.bit:	RMS=1.789150e-08 (PASS) maxdiff=9.685755e-08 (PASS)
fl12.bit:	RMS=1.780872e-08 (PASS) maxdiff=8.940697e-08 (PASS)
fl13.bit:	RMS=1.760690e-08 (PASS) maxdiff=4.470348e-08 (PASS)
fl14.bit:	RMS=3.361258e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl15.bit:	RMS=2.414684e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl16.bit:	RMS=1.924891e-08 (PASS) maxdiff=1.192093e-07 (PASS)
--> 24 bit integer output
fl10.bit:	RMS=4.086103e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl11.bit:	RMS=4.098320e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl12.bit:	RMS=4.095125e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl13.bit:	RMS=4.108581e-08 (PASS) maxdiff=5.960464e-08 (PASS)
fl14.bit:	RMS=4.444728e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl15.bit:	RMS=4.098525e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl16.bit:	RMS=4.146825e-08 (PASS) maxdiff=1.192093e-07 (PASS)
--> 32 bit floating point output
fl10.bit:	RMS=1.777416e-08 (PASS) maxdiff=8.475035e-08 (PASS)
fl11.bit:	RMS=1.789151e-08 (PASS) maxdiff=9.685755e-08 (PASS)
fl12.bit:	RMS=1.780868e-08 (PASS) maxdiff=8.940697e-08 (PASS)
fl13.bit:	RMS=1.760693e-08 (PASS) maxdiff=4.470348e-08 (PASS)
fl14.bit:	RMS=3.361258e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl15.bit:	RMS=2.414676e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl16.bit:	RMS=1.924847e-08 (PASS) maxdiff=1.192093e-07 (PASS)

==== Layer 3 ====
--> 16 bit signed integer output
compl.bit:	RMS=4.300912e-06 (PASS) maxdiff=7.688999e-06 (PASS)
--> 32 bit integer output
compl.bit:	RMS=2.104434e-08 (PASS) maxdiff=1.881272e-07 (PASS)
--> 24 bit integer output
compl.bit:	RMS=4.170551e-08 (PASS) maxdiff=2.384186e-07 (PASS)
--> 32 bit floating point output
compl.bit:	RMS=2.104434e-08 (PASS) maxdiff=1.881272e-07 (PASS)

==== Layer 3 intensity stereo ====
   (no official reference, comparing to mpg123 generic 24 bit)
--> 16 bit signed integer output
drumshort08kHz.bit:	RMS=4.348691e-06 (PASS) maxdiff=7.629395e-06 (PASS)
drumshort24kHz.bit:	RMS=4.365981e-06 (PASS) maxdiff=7.688999e-06 (PASS)
drumshort48kHz.bit:	RMS=4.375106e-06 (PASS) maxdiff=8.106232e-06 (PASS)
mono-is-ms.bit:	RMS=4.389831e-06 (PASS) maxdiff=7.688999e-06 (PASS)
--> 32 bit integer output
drumshort08kHz.bit:	RMS=3.281180e-08 (PASS) maxdiff=1.043081e-07 (PASS)
drumshort24kHz.bit:	RMS=3.282391e-08 (PASS) maxdiff=1.192093e-07 (PASS)
drumshort48kHz.bit:	RMS=4.068793e-08 (PASS) maxdiff=6.854534e-07 (PASS)
mono-is-ms.bit:	RMS=3.511104e-08 (PASS) maxdiff=2.197921e-07 (PASS)
--> 24 bit integer output
drumshort08kHz.bit:	RMS=3.600636e-09 (PASS) maxdiff=5.960464e-08 (PASS)
drumshort24kHz.bit:	RMS=2.518008e-09 (PASS) maxdiff=1.192093e-07 (PASS)
drumshort48kHz.bit:	RMS=2.917921e-08 (PASS) maxdiff=7.152557e-07 (PASS)
mono-is-ms.bit:	RMS=1.635551e-08 (PASS) maxdiff=1.788139e-07 (PASS)
--> 32 bit floating point output
drumshort08kHz.bit:	RMS=3.281174e-08 (PASS) maxdiff=1.043081e-07 (PASS)
drumshort24kHz.bit:	RMS=3.282395e-08 (PASS) maxdiff=1.192093e-07 (PASS)
drumshort48kHz.bit:	RMS=4.068791e-08 (PASS) maxdiff=6.854534e-07 (PASS)
mono-is-ms.bit:	RMS=3.511108e-08 (PASS) maxdiff=2.197921e-07 (PASS)

==== Overall result ====
PASS (limited or full)

Now the generic decoder:

==== Layer 1 ====
--> 16 bit signed integer output
fl1.bit:	RMS=4.364373e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl2.bit:	RMS=4.353138e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl3.bit:	RMS=4.348759e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl4.bit:	RMS=4.403421e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl5.bit:	RMS=4.323446e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl6.bit:	RMS=4.389641e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl7.bit:	RMS=3.826083e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl8.bit:	RMS=4.362205e-06 (PASS) maxdiff=7.629395e-06 (PASS)
--> 32 bit integer output
fl1.bit:	RMS=1.977733e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl2.bit:	RMS=1.980311e-08 (PASS) maxdiff=1.117587e-07 (PASS)
fl3.bit:	RMS=2.006633e-08 (PASS) maxdiff=1.341105e-07 (PASS)
fl4.bit:	RMS=1.911986e-08 (PASS) maxdiff=1.266599e-07 (PASS)
fl5.bit:	RMS=4.047884e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl6.bit:	RMS=3.178246e-08 (PASS) maxdiff=1.639128e-07 (PASS)
fl7.bit:	RMS=1.775744e-08 (PASS) maxdiff=1.043081e-07 (PASS)
fl8.bit:	RMS=1.866297e-08 (PASS) maxdiff=8.195639e-08 (PASS)
--> 24 bit integer output
fl1.bit:	RMS=4.119282e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl2.bit:	RMS=4.184623e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl3.bit:	RMS=4.153068e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl4.bit:	RMS=4.118697e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl5.bit:	RMS=4.816338e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl6.bit:	RMS=4.047773e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl7.bit:	RMS=4.191854e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl8.bit:	RMS=4.106042e-08 (PASS) maxdiff=1.192093e-07 (PASS)
--> 32 bit floating point output
fl1.bit:	RMS=1.977741e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl2.bit:	RMS=1.980280e-08 (PASS) maxdiff=1.117587e-07 (PASS)
fl3.bit:	RMS=2.006633e-08 (PASS) maxdiff=1.341105e-07 (PASS)
fl4.bit:	RMS=1.911983e-08 (PASS) maxdiff=1.266599e-07 (PASS)
fl5.bit:	RMS=4.047868e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl6.bit:	RMS=3.178251e-08 (PASS) maxdiff=1.639128e-07 (PASS)
fl7.bit:	RMS=1.775792e-08 (PASS) maxdiff=1.043081e-07 (PASS)
fl8.bit:	RMS=1.866297e-08 (PASS) maxdiff=8.195639e-08 (PASS)

==== Layer 2 ====
--> 16 bit signed integer output
fl10.bit:	RMS=3.512100e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl11.bit:	RMS=3.837267e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl12.bit:	RMS=3.901071e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl13.bit:	RMS=4.379583e-06 (PASS) maxdiff=7.629395e-06 (PASS)
fl14.bit:	RMS=4.112596e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl15.bit:	RMS=4.388557e-06 (PASS) maxdiff=7.688999e-06 (PASS)
fl16.bit:	RMS=4.147495e-06 (PASS) maxdiff=7.688999e-06 (PASS)
--> 32 bit integer output
fl10.bit:	RMS=1.788206e-08 (PASS) maxdiff=8.195639e-08 (PASS)
fl11.bit:	RMS=1.798147e-08 (PASS) maxdiff=1.005828e-07 (PASS)
fl12.bit:	RMS=1.791770e-08 (PASS) maxdiff=8.568168e-08 (PASS)
fl13.bit:	RMS=1.770191e-08 (PASS) maxdiff=4.470348e-08 (PASS)
fl14.bit:	RMS=4.111211e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl15.bit:	RMS=2.477557e-08 (PASS) maxdiff=1.639128e-07 (PASS)
fl16.bit:	RMS=1.970979e-08 (PASS) maxdiff=1.490116e-07 (PASS)
--> 24 bit integer output
fl10.bit:	RMS=4.102704e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl11.bit:	RMS=4.113184e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl12.bit:	RMS=4.107583e-08 (PASS) maxdiff=1.192093e-07 (PASS)
fl13.bit:	RMS=4.127499e-08 (PASS) maxdiff=5.960464e-08 (PASS)
fl14.bit:	RMS=4.977907e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl15.bit:	RMS=4.145519e-08 (PASS) maxdiff=1.788139e-07 (PASS)
fl16.bit:	RMS=4.171672e-08 (PASS) maxdiff=1.788139e-07 (PASS)
--> 32 bit floating point output
fl10.bit:	RMS=1.788201e-08 (PASS) maxdiff=8.195639e-08 (PASS)
fl11.bit:	RMS=1.798150e-08 (PASS) maxdiff=1.005828e-07 (PASS)
fl12.bit:	RMS=1.791763e-08 (PASS) maxdiff=8.568168e-08 (PASS)
fl13.bit:	RMS=1.770194e-08 (PASS) maxdiff=4.470348e-08 (PASS)
fl14.bit:	RMS=4.111203e-08 (PASS) maxdiff=1.490116e-07 (PASS)
fl15.bit:	RMS=2.477554e-08 (PASS) maxdiff=1.639128e-07 (PASS)
fl16.bit:	RMS=1.970946e-08 (PASS) maxdiff=1.490116e-07 (PASS)

==== Layer 3 ====
--> 16 bit signed integer output
compl.bit:	RMS=4.300914e-06 (PASS) maxdiff=7.688999e-06 (PASS)
--> 32 bit integer output
compl.bit:	RMS=2.147540e-08 (PASS) maxdiff=1.750886e-07 (PASS)
--> 24 bit integer output
compl.bit:	RMS=4.202659e-08 (PASS) maxdiff=1.788139e-07 (PASS)
--> 32 bit floating point output
compl.bit:	RMS=2.147539e-08 (PASS) maxdiff=1.750886e-07 (PASS)

==== Layer 3 intensity stereo ====
   (no official reference, comparing to mpg123 generic 24 bit)
--> 16 bit signed integer output
drumshort08kHz.bit:	RMS=4.348733e-06 (PASS) maxdiff=7.748604e-06 (PASS)
drumshort24kHz.bit:	RMS=4.366053e-06 (PASS) maxdiff=7.808208e-06 (PASS)
drumshort48kHz.bit:	RMS=4.375036e-06 (PASS) maxdiff=7.748604e-06 (PASS)
mono-is-ms.bit:	RMS=4.389819e-06 (PASS) maxdiff=7.629395e-06 (PASS)
--> 32 bit integer output
drumshort08kHz.bit:	RMS=3.685351e-08 (PASS) maxdiff=4.172325e-07 (PASS)
drumshort24kHz.bit:	RMS=3.893594e-08 (PASS) maxdiff=7.450581e-07 (PASS)
drumshort48kHz.bit:	RMS=3.389556e-08 (PASS) maxdiff=2.607703e-07 (PASS)
mono-is-ms.bit:	RMS=3.372314e-08 (PASS) maxdiff=8.940697e-08 (PASS)
--> 24 bit integer output
drumshort08kHz.bit:	RMS=2.297661e-08 (PASS) maxdiff=4.172325e-07 (PASS)
drumshort24kHz.bit:	RMS=2.677607e-08 (PASS) maxdiff=7.748604e-07 (PASS)
drumshort48kHz.bit:	RMS=1.460054e-08 (PASS) maxdiff=2.384186e-07 (PASS)
mono-is-ms.bit:	RMS=9.138218e-09 (PASS) maxdiff=5.960464e-08 (PASS)
--> 32 bit floating point output
drumshort08kHz.bit:	RMS=3.685353e-08 (PASS) maxdiff=4.172325e-07 (PASS)
drumshort24kHz.bit:	RMS=3.893599e-08 (PASS) maxdiff=7.450581e-07 (PASS)
drumshort48kHz.bit:	RMS=3.389551e-08 (PASS) maxdiff=2.607703e-07 (PASS)
mono-is-ms.bit:	RMS=3.372002e-08 (PASS) maxdiff=8.940697e-08 (PASS)

==== Overall result ====
PASS (limited or full)

Depending on what integer quality mode you choose at compile time (and the decoder in use), the 16bit output can vary between PASS and LIMITED for fully or limited accuracy compliance. But keep in mind: For the integer output, you have to give +-1 for rounding... that's what I append to any integer number read from some measurement device anyway, by default. That minimum possible deviation already brings the output close (or over) the border of full compliance... that really does not mean that the output sounds bad! It shall be noted that a measure to improve subjective quality, namely the dithering before rounding to integers, can also increase the theoretical decoding error.

In the end, RMS values in the order of 10 to the power of -5 should sound just fine. To get 16bit output to PASS, you usually need to enable proper rounding using the --enable-int-quality configure flag, which is on by default since some time now. On a specific (older) system, you might consider turning that off for possibly a slight performance gain.

For comparisong with other decoders (as well as older incarnations of the mpg123 engine), have a read of the Underbit compliance tests. Actually, my testing method follows that example, including their quoting of ISO MPEG rules.

Regression tests

This is output from the rudimentary regression test suite (which should eventually merge several approaches we had on testing in the past), working on the periodic snapshot: 

cc -Os  -I/tmp/mpg123-svn.J1fao/prefix/include  -c -o helpers.o helpers.c
CC 2859531_id3_tag_not_skipped_when_NO_ID3V2_is_defined.bin
CC 2950218_extra_samples_seek_last_frame.bin
CC basic_resync.bin
CC bug201_another_one.bin
CC bug201_wrong_frame_buffer.bin
CC chomp_strings.bin
CC custom_io.bin
CC frame_seek_weirdness.bin
CC freeformat.bin
CC less_bytes_after_seek2.bin
CC less_bytes_after_seek.bin
CC more_bytes_on_second_decode.bin
CC out123_errorlist.bin
CC out123_passthrough.bin
CC premature_decoder_change.bin
CC seek_accuracy.bin
CC string_alloc.bin
Running tests.
Starting tests, look into test.log for messages.
PASS|SKIP is good, FAIL is bad.

2859531_id3_tag_not_skipped_when_NO_ID3V2_is_defined:     PASS
2950218_extra_samples_seek_last_frame:                    PASS
basic_resync:                                             PASS
bug201_another_one:                                       PASS
bug201_wrong_frame_buffer:                                PASS
chomp_strings:                                            PASS
custom_io:                                                PASS
frame_seek_weirdness:                                     PASS
freeformat:                                               PASS
less_bytes_after_seek2:                                   PASS
less_bytes_after_seek:                                    PASS
more_bytes_on_second_decode:                              PASS
out123_errorlist:                                         PASS
out123_passthrough:                                       PASS
premature_decoder_change:                                 PASS
seek_accuracy:                                            PASS
string_alloc:                                             PASS

PASS

Build tests

Testing some build setups and looking at libmpg123 size. 

Testing builds ...
config:
build default: PASS
   libmpg123.so=264K libsyn123.so=74K libout123.so=55K mpg123=139K out123=62K
config: --disable-shared
build static: PASS
   libmpg123.a=389K libsyn123.a=94K libout123.a=87K mpg123=456K out123=150K
config: --enable-portable
build portable: PASS
   libmpg123.so=256K libsyn123.so=74K libout123.so=55K out123=62K
config: --disable-8bit
build just no 8 bit: PASS
   libmpg123.so=256K libsyn123.so=74K libout123.so=55K mpg123=139K out123=62K
config: --disable-buffer --disable-feeder
config: --disable-messages --disable-moreinfo
config: --disable-feature_report --disable-network
config: --disable-icy --disable-id3v2 --disable-ntom
config: --disable-8bit --disable-16bit --disable-32bit
config: --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
build minimal mpg123: PASS
   libmpg123.so=124K libsyn123.so=74K libout123.so=34K mpg123=115K out123=54K
config: --disable-buffer --disable-feeder
config: --disable-messages --disable-moreinfo
config: --disable-feature_report --disable-network
config: --disable-icy --disable-id3v2 --disable-ntom
config: --disable-8bit --disable-16bit --disable-32bit
config: --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
config: --enable-portable --disable-string
build minimal libmpg123: PASS
   libmpg123.so=111K
config: --disable-buffer --disable-feeder
config: --disable-messages --disable-moreinfo
config: --disable-feature_report --disable-network
config: --disable-icy --disable-id3v2 --disable-ntom
config: --disable-8bit --disable-16bit --disable-32bit
config: --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
config: --enable-portable --disable-string
config: --with-cpu=generic
build minimal generic libmpg123: PASS
   libmpg123.so=99K
config: --with-audio=dummy
build cross arm-linux-gnueabihf default: PASS
   libmpg123.so=264K libsyn123.so=74K libout123.so=55K mpg123=139K out123=62K
config: --with-audio=dummy --disable-buffer
config: --disable-feeder --disable-messages
config: --disable-moreinfo --disable-feature_report
config: --disable-network --disable-icy --disable-id3v2
config: --disable-ntom --disable-8bit --disable-16bit
config: --disable-32bit --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
build cross arm-linux-gnueabihf minimal mpg123: PASS
   libmpg123.so=124K libsyn123.so=74K libout123.so=34K mpg123=115K out123=54K
config: --with-audio=dummy --disable-buffer
config: --disable-feeder --disable-messages
config: --disable-moreinfo --disable-feature_report
config: --disable-network --disable-icy --disable-id3v2
config: --disable-ntom --disable-8bit --disable-16bit
config: --disable-32bit --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
config: --enable-portable --disable-string
build cross arm-linux-gnueabihf minimal libmpg123: PASS
   libmpg123.so=111K
config: --with-audio=dummy
build cross aarch64-linux-gnu default: PASS
   libmpg123.so=264K libsyn123.so=74K libout123.so=55K mpg123=139K out123=62K
config: --with-audio=dummy --disable-buffer
config: --disable-feeder --disable-messages
config: --disable-moreinfo --disable-feature_report
config: --disable-network --disable-icy --disable-id3v2
config: --disable-ntom --disable-8bit --disable-16bit
config: --disable-32bit --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
build cross aarch64-linux-gnu minimal mpg123: PASS
   libmpg123.so=124K libsyn123.so=74K libout123.so=34K mpg123=115K out123=54K
config: --with-audio=dummy --disable-buffer
config: --disable-feeder --disable-messages
config: --disable-moreinfo --disable-feature_report
config: --disable-network --disable-icy --disable-id3v2
config: --disable-ntom --disable-8bit --disable-16bit
config: --disable-32bit --disable-layer1 --disable-layer2
config: --enable-runtime-tables --disable-downsample
config: --disable-equalizer --disable-ieeefloat
config: --enable-portable --disable-string
build cross aarch64-linux-gnu minimal libmpg123: PASS
   libmpg123.so=111K

Needed computing power

A test (GNU/Linux OS) with 0.60-beta2 showed 3 % to 4 % CPU usage on decoding high quality VBR MP3 with a pentiumII laptop with 366MHz, while a pentium 100MHz can easily handle two mpg123 instances in realtime (plus the mixing daemon that works on decoded data). Well, and more recently, A Core2Duo P8600 core can do 500 times realtime decoding (a track nearly five minutes long decoded in half a second).

Also, we have reports from such devices as nintendo DS or Sony PSP, or various embedded systems...

Michael said once upon a time

Plays Layer 3 in stereo on an AMD-486-120Mhz or (of course) a faster machine.

Just for info: mpg123 plays an average 128bps stream, with about 66% in full quality on an AMD 486-133MHz machine.

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